Collection tube assembly



FIG. 1 is a front perspective view of a collection tube assembly in accordance with our new design;

FIG. 2 is a rear elevation view of the collection tube assembly shown in FIG. 1;

FIG. 3 is a top plan view of the collection tube assembly shown in FIG. 1; and,

FIG. 4 is a bottom plan view of the collection tube assembly shown in FIG. 1.

The broken lines, the areas within them, and the areas bounded by broken and solid lines depict portions of the collection tube assembly that form no part of the claimed design. 

CLAIM The ornamental design for a collection tube assembly, as shown and described. 